50705538581 has 2 divisors, whose sum is σ = 50705538582. Its totient is φ = 50705538580.

The previous prime is 50705538551. The next prime is 50705538589. The reversal of 50705538581 is 18583550705.

50705538581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33330344356 + 17375194225 = 182566^2 + 131815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50705538581 is a prime.

It is a super-2 number, since 2×50705538581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50705538589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25352769290 + 25352769291.

It is an arithmetic number, because the mean of its divisors is an integer number (25352769291).

Almost surely, 2^50705538581 is an apocalyptic number.

It is an amenable number.

50705538581 is a deficient number, since it is larger than the sum of its proper divisors (1).

50705538581 is an equidigital number, since it uses as much as digits as its factorization.

50705538581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840000, while the sum is 47.

The spelling of 50705538581 in words is "fifty billion, seven hundred five million, five hundred thirty-eight thousand, five hundred eighty-one".